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RE: Question
wouldn't need it.
all the charging circuitry is already there.
Just need a connection.
I'm pretty sure (I used to be an electronic tech) that the voltage is stepped down from 120v to charge the leeetle bitty LIon cells (charging voltage is about four volts)
5 volts per cell is what they use, 4.2 is a fully charged Lithium Ion. I bet you could bypass the AC part and supply 25v to the charge buss and do it! :D Then the charge rate (speed) would be determined by the ampacity of the source.
Since you got the PPS for "free" it's OK to hack it, right? :D